Water Heater Repair
& Installation
Expert installation, repair, and replacement of tank and tankless water heaters. Same-day service from your trusted Colorado plumbing team.
Hot Water When You Need It
Your water heater works hard every day — powering hot showers, clean dishes, and comfortable living. When it stops working, life grinds to a halt. Whether your unit is leaking, producing lukewarm water, or simply past its prime, you need a fast, reliable solution.
For nearly 30 years, M&M Heating, Cooling, Plumbing & Electrical has helped Longmont and Front Range homeowners with expert water heater installation, repair, and replacement. We service all major brands and work with both traditional tank and energy-efficient tankless systems to find the right fit for your home and budget.
Common Water Heater Issues
From cold showers to leaking tanks, we've seen it all and fixed it all.
No Hot Water
A water heater that produces no hot water at all could have a failed heating element, faulty thermostat, or a pilot light issue. We diagnose and repair the problem quickly so you're not left in the cold.
Inconsistent Temperature
Water that fluctuates between hot and cold often points to a failing thermostat, sediment buildup, or an undersized unit. We'll find the cause and restore reliable, consistent hot water to your home.
Strange Noises or Rumbling
Popping, rumbling, or banging sounds from your water heater usually mean sediment has built up at the bottom of the tank. A flush may solve the problem, or it could be time for a replacement.
Leaking Water Heater
A leaking water heater can cause serious water damage to your home. Whether it's a faulty valve, a corroded tank, or a loose connection, we'll identify the source and fix it — or replace the unit if needed.
Rusty or Discolored Water
Rusty or brown water coming from your hot water tap is a sign of corrosion inside the tank or deteriorating anode rod. Left unchecked, this can lead to tank failure and costly water damage.
Old Unit (10+ Years)
Most tank water heaters last 8–12 years. If yours is over 10 years old, it's likely losing efficiency and is at higher risk of failure. We can help you upgrade to a modern, energy-efficient system.
Tank vs. Tankless Water Heaters
Both options have clear advantages. We'll help you choose the one that makes the most sense for your household, usage, and budget.
Traditional Tank
The workhorse of home hot water. Stores 40–50 gallons and keeps it heated around the clock so it's ready when you need it.
- Lowest upfront investment
- Fast, straightforward installation
- 8–12 year average lifespan
- Works with any fuel type
Tankless System
Heats water only when you turn the tap. No standby loss means lower bills and hot water that never runs out, no matter how many showers run back to back.
- Unlimited hot water on demand
- Save up to $300/year on energy
- 15–20 year average lifespan
- Compact, wall-mounted design
Heat Pump
Pulls heat from surrounding air instead of creating it. Uses a fraction of the electricity of conventional units — the most efficient option available today.
- Save up to $400/year on energy
- Federal tax credits up to $2,000
- 12–15 year average lifespan
- Zero combustion emissions
Save Money Every Month
- Cut water heating bills by up to 70% with a heat pump
- Claim federal tax credits up to $2,000 on qualifying units
- Check for Colorado utility rebates at time of install
- Add value to your home with a high-efficiency upgrade
Upgrade Your Daily Comfort
- Never run out of hot water mid-shower again
- Monitor usage and adjust settings from your phone
- Free up garage or utility room space with compact designs
- Enjoy whisper-quiet operation throughout the house
The M&M Difference
Why Longmont and the Front Range trusts us for water heater services.
All Major Brands
We install, repair, and service all major water heater brands including Rheem, Bradford White, A.O. Smith, Rinnai, Navien, and more — both tank and tankless models.
Same-Day Service
No hot water is an emergency. We offer same-day water heater service so you're never stuck waiting days for a repair or replacement.
Upfront, Honest Pricing
You'll know the cost before we start. No hidden fees, no surprises — just transparent pricing you can trust.
Licensed & Insured
Our technicians are fully licensed, background-checked, and insured. You can trust the people we send into your home to do the job right.
Our 4-Step Process
We get it right the first time, every time.
Diagnose
We start with a thorough inspection of your water heater, checking the tank, connections, valves, and components. We identify the root cause of the issue and assess whether a repair or replacement is the best path forward.
Recommend Options
Based on our findings, we present your options — whether that's a targeted repair, a traditional tank replacement, or an upgrade to a tankless system — and explain the cost upfront before any work begins.
Install or Repair
Our licensed technicians handle the installation or repair using professional-grade equipment and manufacturer-approved parts. We ensure your system is properly sized, correctly connected, and up to code.
Test & Warranty
We thoroughly test the system to verify proper operation, check for leaks, confirm correct temperature settings, and walk you through your warranty coverage and maintenance tips to maximize the life of your water heater.
Your Water Heater Questions Answered
What's the difference between a tank and tankless water heater?
A traditional tank water heater stores and continuously heats a large reservoir of water (typically 40–50 gallons), so hot water is available on demand until the tank runs out. A tankless (on-demand) water heater heats water only as it flows through the unit, providing an endless supply of hot water while using less energy. Tankless units cost more upfront but can save on energy bills over time. We can help you decide which option is best for your household's needs and budget.
How long does a water heater last?
A traditional tank water heater typically lasts 8–12 years, while a tankless water heater can last 15–20 years or more with proper maintenance. Factors like water quality, usage patterns, and regular maintenance all affect lifespan. If your tank unit is over 10 years old, we recommend having it inspected so you can plan ahead rather than deal with an unexpected failure.
What are the signs I need a new water heater?
Watch for these warning signs: inconsistent or lukewarm water, rusty or discolored hot water, rumbling or banging noises from the tank, visible leaks or pooling water around the base, rising energy bills, or a unit that's more than 10 years old. If you're experiencing any of these, give us a call for an honest assessment — sometimes a repair is all you need, and we'll tell you so.
How much does water heater installation cost?
The cost of water heater installation depends on the type of unit (tank vs. tankless), the size of the system, and the complexity of the installation. We provide upfront pricing before any work begins — no hidden fees, no surprises. Give us a call or schedule a free in-home estimate and we'll provide an honest quote tailored to your home's needs.
Do you service all water heater brands?
Yes! We service, repair, and install all major water heater brands including Rheem, Bradford White, A.O. Smith, Rinnai, Navien, Noritz, and more. Whether you have a traditional tank or tankless system, gas or electric, our technicians have the training and experience to get the job done right.
Need Water Heater Service?
Open 24/7 | Same-Day Service Available
Call (720) 608-3973Water Heater Services Across the Front Range
Proudly serving Longmont, CO and surrounding communities.
Primary Service Area
- Longmont, CO
- Erie, CO
- Frederick, CO
- Firestone, CO
- Dacono, CO
Extended Area
- Mead, CO
- Johnstown, CO
- Berthoud, CO
- Niwot, CO
- Gunbarrel, CO
Also Serving
- Lafayette, CO
- Louisville, CO
- Superior, CO
